Groovy超强的Java动态计算能力

//Groovy超强的Java动态计算能力 groovy-2.5.12.jar apache  表达式语言 
public class GroovyTest {

public static void main(String[] args) {

GroovyShell shell = new GroovyShell();
        Object result = shell.evaluate("(1+5)/2");
        System.out.println(result);
       
        Binding binding = new Binding();
        binding.setVariable("p",3.1415926f);
        binding.setVariable("r",5);
        GroovyShell shell2 = new GroovyShell(binding);
        result = shell2.evaluate("p*r*r");
        System.out.println(result);
       
        result = shell2.evaluate("Math.round(p*r*r)");
        System.out.println(result);
       
        String s = "2>3||3>4&&5<4";
        result = shell.evaluate(s);
        System.out.println(result);
       
//        String javacode="SimpleDateFormat.getDateInstance().format(new Date())";
//        result = shell.evaluate(javacode);
//        System.out.println(result);
       
        //shell.parse(new File(//)) 
        Script script = shell2.parse("def join(String[] list) {return list.join('--');}"); 
        String joinString = (String)script.invokeMethod("join", new String[]{"A1","B2","C3"}); 
        System.out.println(joinString);
       
        //反射动态调用groovy类
        GroovyTest g=new GroovyTest();
//        g.java2groovy();
       
       
        g.grooyScript();
        //自定义函数
       
}

private void java2groovy() {
//获取 groovy 类的反射对象
        ClassLoader parent = getClass().getClassLoader(); 
        GroovyClassLoader loader = new GroovyClassLoader(parent); 
        Class groovyClass=null;
try {
groovyClass = loader.parseClass(new File("G:\\neweclipse\\workspace\\bsh\\src\\bsh\\GroovyDemo.groovy"));
//实例化 GroovyDemo 类
        GroovyObject groovyObj = (GroovyObject) groovyClass.newInstance(); 
        //调用 groovyDemo 成员方法
        System.out.println( groovyObj.invokeMethod("sayHello",null));
} catch (CompilationFailedException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} 
}

//自定义函数
void grooyScript() {
String path = "G:\\neweclipse\\workspace\\bsh\\src\\bsh\\";
GroovyScriptEngine gse;
try {
gse = new GroovyScriptEngine(path);
Binding binding = new Binding();
binding.setVariable("input", "Groovy");
gse.run("GroovyDemo.groovy", binding);
System.out.println(binding.getVariable("output"));
} catch (Exception e) {
e.printStackTrace();
}
}

//自定义函数
void cusFunction() {
Binding binding = new Binding();
//         if(vars!=null) {
//             vars.keySet().forEach(name ->
//                     binding.setVariable(name, vars.get(name))
//             );
//         }
        CompilerConfiguration cfg = new CompilerConfiguration();
        cfg.setScriptBaseClass(DateUtils.class.getName());
        GroovyShell shell = new GroovyShell(binding,cfg);

        try {
            Script script = shell.parse(buildScript());
            return script.run();
        } catch (Exception ex) {
            logger.error("catch script execution error, script:"+buildScript(), ex);
            return 0;
        }
}

}